From 904eefaf8a82ea10c0a804c58a11110fa296a74a Mon Sep 17 00:00:00 2001
From: hedaoyuan <hedaoyuan@github.com>
Date: Tue, 3 Jan 2017 15:51:07 +0800
Subject: [PATCH] add TensorShape use to represent tensor of any dimension.

---
 paddle/function/TensorType.h       | 125 +++++++++++++++++++++++++++++
 paddle/function/TensorTypeTest.cpp |  53 ++++++++++++
 2 files changed, 178 insertions(+)
 create mode 100644 paddle/function/TensorType.h
 create mode 100644 paddle/function/TensorTypeTest.cpp

diff --git a/paddle/function/TensorType.h b/paddle/function/TensorType.h
new file mode 100644
index 00000000000..0b860f20460
--- /dev/null
+++ b/paddle/function/TensorType.h
@@ -0,0 +1,125 @@
+/* Copyright (c) 2016 PaddlePaddle Authors. All Rights Reserve.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License. */
+
+#pragma once
+
+#include <glog/logging.h>
+
+namespace paddle {
+
+enum ValueType {
+  VALUE_TYPE_INT32 = 0,
+  VALUE_TYPE_FLOAT = 1,
+  VALUE_TYPE_DOUBLE = 2,
+  VALUE_TYPE_BYTE = 3
+};
+
+enum DeviceType {
+  DEVICE_TYPE_UNSPECIFIED = 0,
+  DEVICE_TYPE_CPU = 1,
+  DEVICE_TYPE_GPU = 2
+};
+
+inline int sizeOfValuType(ValueType valueType) {
+  if (valueType == VALUE_TYPE_INT32) {
+    return 4;
+  } else if (valueType == VALUE_TYPE_FLOAT) {
+    return 4;
+  } else if (valueType == VALUE_TYPE_DOUBLE) {
+    return 8;
+  } else {
+    LOG(FATAL) << "Unknown type: " << valueType;
+    return 0;
+  }
+}
+
+template <typename T>
+struct DataType;
+
+template <>
+struct DataType<float> {
+  static const ValueType value = VALUE_TYPE_FLOAT;
+};
+
+template <>
+struct DataType<double> {
+  static const ValueType value = VALUE_TYPE_DOUBLE;
+};
+
+/**
+ * TensorShape used to represent shape of normal tensor.
+ */
+class TensorShape {
+public:
+  TensorShape() : ndims_(0), nelements_(0) { initDims(0); }
+
+  TensorShape(size_t ndims) : ndims_(ndims), nelements_(1) { initDims(ndims); };
+
+  TensorShape(std::initializer_list<size_t> dims) {
+    ndims_ = dims.size();
+    initDims(ndims_);
+    std::copy(dims.begin(), dims.end(), dims_.begin());
+    numElements();
+  };
+
+  TensorShape(const TensorShape& t)
+      : ndims_(t.ndims_), nelements_(t.nelements_) {
+    initDims(ndims_);
+    std::copy(t.dims_.begin(), t.dims_.end(), dims_.begin());
+  };
+
+  // get the size of specified dimension
+  size_t operator[](size_t dim) const {
+    CHECK_GE(dim, 0);
+    CHECK_LT(dim, ndims_);
+    return dims_[dim];
+  }
+
+  // set the size of specified dimension
+  void setDim(size_t dim, size_t size) {
+    CHECK_GE(dim, 0);
+    CHECK_LT(dim, ndims_);
+    dims_[dim] = size;
+    numElements();
+  }
+
+  // number of dimensions of the tensor
+  size_t ndims() const { return ndims_; }
+
+  size_t getElements() const { return nelements_; }
+
+private:
+  // compute number of elements
+  void numElements() {
+    nelements_ = 1;
+    for (size_t n = 0; n < ndims_; n++) {
+      nelements_ *= dims_[n];
+    }
+  }
+
+  // init dims_
+  void initDims(size_t ndims) {
+    size_t count = ndims < 4 ? 4 : ndims;
+    dims_.assign(count, 1);
+  }
+
+  // number of dimensions
+  // ndims_ may be not equeal dims_.size()
+  size_t ndims_;
+  // number of elements
+  size_t nelements_;
+  std::vector<size_t> dims_;
+};
+
+}  // namespace paddle
diff --git a/paddle/function/TensorTypeTest.cpp b/paddle/function/TensorTypeTest.cpp
new file mode 100644
index 00000000000..99c25f42a1e
--- /dev/null
+++ b/paddle/function/TensorTypeTest.cpp
@@ -0,0 +1,53 @@
+/* Copyright (c) 2016 PaddlePaddle Authors. All Rights Reserve.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License. */
+
+#include "TensorType.h"
+#include <gtest/gtest.h>
+
+namespace paddle {
+
+TEST(TensorShape, Constructor) {
+  TensorShape t1;
+  EXPECT_EQ(t1.ndims(), 0);
+  EXPECT_EQ(t1.getElements(), 0);
+
+  TensorShape t2(3);
+  EXPECT_EQ(t2.ndims(), 3);
+  EXPECT_EQ(t2.getElements(), 1);
+
+  TensorShape t3({8, 10});
+  EXPECT_EQ(t3.ndims(), 2);
+  EXPECT_EQ(t3.getElements(), 80);
+
+  TensorShape t4(t3);
+  EXPECT_EQ(t4.ndims(), t3.ndims());
+  EXPECT_EQ(t4.getElements(), t3.getElements());
+
+  TensorShape t5({1, 2, 3, 4, 5});
+  EXPECT_EQ(t5.ndims(), 5);
+  EXPECT_EQ(t5.getElements(), 120);
+}
+
+TEST(TensorShape, GetAndSet) {
+  TensorShape t({1, 2, 3});
+  EXPECT_EQ(t.ndims(), 3);
+  EXPECT_EQ(t.getElements(), 6);
+
+  EXPECT_EQ(t[1], 2);
+  t.setDim(1, 100);
+  EXPECT_EQ(t.getElements(), 300);
+  EXPECT_EQ(t[1], 100);
+}
+
+}  // namespace paddle
-- 
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